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Am setting up paypal button in wordpress for access to level one but when I have made button and test it I get an error on paypal : Invalid Regular period. You must specify valid values for the A3, P3 and T3 parameters for a subscription.

Can you tell me where going wrong

You can try this post and see if this helps:
viewtopic.php?f=4&t=15629&p=48637&hilit=A3%2C+P3+T3#p48637

Hope this helps.

Thanks this appears to have worked for me when using long code

Re: PayPal button error
by ktkfo4 » June 28th, 2011, 7:59 am

I think that the button code comments (<!-- ...) lead to these extra paragraphs that destroy the button in the source code. I removed all comments and now the button works as it should.

OK, glad it works now.
You should know that the long code (HTML code) can sometimes contain some PHP, so you might consider installing the Exec-PHP plugin.

Hope this helps.